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Well I finally got around to this tonight, and it didn't go well. I figured I'd start with my Tolino Vision 6 to validate my SD writing procedure since it was already working. I cracked open the Tolino and managed to get the card out from that awful conformal coating, cleaned it, and imaged it in my computer. I also cleaned out the SD card slot on the Tolino with some paperboard and isopropyl alcohol (after disconnecting the battery). I let it dry, put the original card back in, reconnected the battery, and tried to power it on, but it's not booting!
When connected to the computer, it identifies itself as an Allwinner device. Holding the power button down for 10 seconds makes the device reset. I know the battery connection is okay because I'm getting 3.3V from the power pins on the debug header on the board (with USB disconnected.) There is no change with the card inserted or removed. I'm guessing it can't see the card at all and it's just going into its factory flashing/recovery mode. I don't have any experience with Allwinner devices, but I know Qualcomm Android SoCs work this way.
I think I can still see a little conformal coating sitting at the bottom of the SD card slot, but it's very hard to tell. I cleaned it with paperboard, flushed with IPA, and blew it out with compressed air. I looked and I don't think I damaged any of the nearby SMD components on the board. The SD card reads just fine in my computer. I even flashed and tried a second SD card, no change.
Does anyone have any idea of what to try here? I can make a separate post on the Tolino section if needed.
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